Name: Shimano Bb-un300 Square Taper Bottom Bracket
Brand: Shimano
SKU: 4550170619282
Price: 33.0 AUD
Availability: InStock

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:113mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:118mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:113mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:107mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:110mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:115mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:122mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:117mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:118mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:123mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:122mm]

Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:127mm]

$33.00

Shipping calculated at checkout.

Low stock - 1 item left
Backordered, shipping soon

The Shimano BB-UN300 is a square taper bottom bracket designed for smooth pedalling performance and long-lasting reliability. With sealed cartridge bearings to keep out dirt and moisture, it’s an excellent upgrade or replacement for bikes using a traditional square taper crankset.

Why Choose the Shimano BB-UN300?

Sealed cartridge design provides low-maintenance durability.
Compatible with square taper (JIS) cranksets.
Available in multiple shell widths and spindle lengths to suit a wide range of bikes.
A dependable option for MTB, trekking, hybrid, and city bikes.

Component	Specification
Model	Shimano BB-UN300
Type	Square taper (JIS) bottom bracket
Shell Widths	68 mm, 73 mm
Spindle Lengths	107 mm, 110 mm, 113 mm, 117.5 mm, 122.5 mm, 127.5 mm
Axle Type	Square taper (JIS)
Bearings	Sealed cartridge unit
Application	MTB, trekking, hybrid, city bikes

Specifications subject to change without notice

All Bikes Are Only Avaliable Through Local Pickup

Please select local pickup at checkout

Christmas Standard Post Cut Offs Sending From SA

• To NSW Fri 19 Dec

• To ACT Fri 19 Dec

• To VIC Fri 19 Dec

• To QLD Fri 19 Dec

• To SA Mon 22 Dec

• To WA Thu 18 Dec

• To TAS Fri 19 Dec

• To NT Wed 17 Dec

Christmas Express Post Cut Offs Sending From SA

• To NSW 23 Dec 2025

• To ACT 23 Dec 2025

• To VIC 23 Dec 2025

• To QLD 23 Dec 2025

• To SA 23 Dec 2025

• To WA 22 Dec 2025

• To TAS 22 Dec 2025

• To NT 22 Dec 2025

[{"id":50832868213017,"title":"68mm \/ 107mm","option1":"68mm","option2":"107mm","option3":null,"sku":"4550170619282","requires_shipping":true,"taxable":true,"featured_image":{"id":49897958637849,"product_id":9940980793625,"position":4,"created_at":"2025-06-19T11:37:10+09:30","updated_at":"2025-06-19T11:37:10+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:107mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619282_1.jpg?v=1750298830","variant_ids":[50832868213017]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 107mm","public_title":"68mm \/ 107mm","options":["68mm","107mm"],"price":3300,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619282","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:107mm] ","id":41251915464985,"position":4,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619282_1.jpg?v=1750298830"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832868573465,"title":"68mm \/ 123mm","option1":"68mm","option2":"123mm","option3":null,"sku":"4550170619251","requires_shipping":true,"taxable":true,"featured_image":{"id":49897715269913,"product_id":9940980793625,"position":10,"created_at":"2025-06-19T10:12:33+09:30","updated_at":"2025-06-19T10:12:33+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:123mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619251_1.jpg?v=1750293753","variant_ids":[50832868573465]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 123mm","public_title":"68mm \/ 123mm","options":["68mm","123mm"],"price":3500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619251","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:123mm] ","id":41251755589913,"position":10,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619251_1.jpg?v=1750293753"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832870244633,"title":"68mm \/ 113mm","option1":"68mm","option2":"113mm","option3":null,"sku":"4550170619329","requires_shipping":true,"taxable":true,"featured_image":{"id":49897986294041,"product_id":9940980793625,"position":3,"created_at":"2025-06-19T11:47:05+09:30","updated_at":"2025-06-19T11:47:05+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:113mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619329_1.jpg?v=1750299425","variant_ids":[50832870244633]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 113mm","public_title":"68mm \/ 113mm","options":["68mm","113mm"],"price":3500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619329","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:113mm] ","id":41251936436505,"position":3,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619329_1.jpg?v=1750299425"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832870375705,"title":"73mm \/ 118mm","option1":"73mm","option2":"118mm","option3":null,"sku":"4550170619244","requires_shipping":true,"taxable":true,"featured_image":{"id":49897987375385,"product_id":9940980793625,"position":2,"created_at":"2025-06-19T11:47:29+09:30","updated_at":"2025-06-19T11:47:29+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:118mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619244_1.jpg?v=1750299449","variant_ids":[50832870375705]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 73mm \/ 118mm","public_title":"73mm \/ 118mm","options":["73mm","118mm"],"price":3300,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619244","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:118mm] ","id":41251937157401,"position":2,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619244_1.jpg?v=1750299449"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832870408473,"title":"73mm \/ 113mm","option1":"73mm","option2":"113mm","option3":null,"sku":"4550170619213","requires_shipping":true,"taxable":true,"featured_image":{"id":49897988260121,"product_id":9940980793625,"position":1,"created_at":"2025-06-19T11:47:55+09:30","updated_at":"2025-06-19T11:47:55+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:113mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619213_1.jpg?v=1750299475","variant_ids":[50832870408473]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 73mm \/ 113mm","public_title":"73mm \/ 113mm","options":["73mm","113mm"],"price":4000,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619213","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:113mm] ","id":41251937747225,"position":1,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619213_1.jpg?v=1750299475"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832870605081,"title":"68mm \/ 118mm","option1":"68mm","option2":"118mm","option3":null,"sku":"4550170619237","requires_shipping":true,"taxable":true,"featured_image":{"id":49897726542105,"product_id":9940980793625,"position":9,"created_at":"2025-06-19T10:15:34+09:30","updated_at":"2025-06-19T10:15:34+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:118mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619237_1.jpg?v=1750293934","variant_ids":[50832870605081]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 118mm","public_title":"68mm \/ 118mm","options":["68mm","118mm"],"price":3500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619237","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:118mm] ","id":41251762635033,"position":9,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619237_1.jpg?v=1750293934"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832870670617,"title":"68mm \/ 117mm","option1":"68mm","option2":"117mm","option3":null,"sku":"4550170619220","requires_shipping":true,"taxable":true,"featured_image":{"id":49897726640409,"product_id":9940980793625,"position":8,"created_at":"2025-06-19T10:15:38+09:30","updated_at":"2025-06-19T10:15:38+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:117mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619220_1.jpg?v=1750293938","variant_ids":[50832870670617]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 117mm","public_title":"68mm \/ 117mm","options":["68mm","117mm"],"price":3300,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619220","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:117mm] ","id":41251762700569,"position":8,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619220_1.jpg?v=1750293938"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832872702233,"title":"73mm \/ 122mm","option1":"73mm","option2":"122mm","option3":null,"sku":"4550170619305","requires_shipping":true,"taxable":true,"featured_image":{"id":49897765208345,"product_id":9940980793625,"position":7,"created_at":"2025-06-19T10:27:20+09:30","updated_at":"2025-06-19T10:27:20+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:122mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619305_1.jpg?v=1750294640","variant_ids":[50832872702233]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 73mm \/ 122mm","public_title":"73mm \/ 122mm","options":["73mm","122mm"],"price":3499,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619305","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:73mm Lgth:122mm] ","id":41251788882201,"position":7,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619305_1.jpg?v=1750294640"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832914645273,"title":"68mm \/ 127mm","option1":"68mm","option2":"127mm","option3":null,"sku":"4550170619312","requires_shipping":true,"taxable":true,"featured_image":{"id":49897567977753,"product_id":9940980793625,"position":12,"created_at":"2025-06-19T09:39:39+09:30","updated_at":"2025-06-19T09:39:39+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:127mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619312_1.jpg?v=1750291779","variant_ids":[50832914645273]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 127mm","public_title":"68mm \/ 127mm","options":["68mm","127mm"],"price":3499,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619312","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:127mm] ","id":41251654566169,"position":12,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619312_1.jpg?v=1750291779"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832914841881,"title":"68mm \/ 115mm","option1":"68mm","option2":"115mm","option3":null,"sku":"4550170619183","requires_shipping":true,"taxable":true,"featured_image":{"id":49897815048473,"product_id":9940980793625,"position":6,"created_at":"2025-06-19T10:49:58+09:30","updated_at":"2025-06-19T10:49:58+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:115mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619183_1.jpg?v=1750295998","variant_ids":[50832914841881]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 115mm","public_title":"68mm \/ 115mm","options":["68mm","115mm"],"price":3499,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619183","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:115mm] ","id":41251824402713,"position":6,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619183_1.jpg?v=1750295998"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50832915169561,"title":"68mm \/ 122mm","option1":"68mm","option2":"122mm","option3":null,"sku":"4550170619152","requires_shipping":true,"taxable":true,"featured_image":{"id":49897568731417,"product_id":9940980793625,"position":11,"created_at":"2025-06-19T09:39:53+09:30","updated_at":"2025-06-19T09:39:54+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:122mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619152_1.jpg?v=1750291794","variant_ids":[50832915169561]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 122mm","public_title":"68mm \/ 122mm","options":["68mm","122mm"],"price":3300,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619152","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:122mm] ","id":41251655221529,"position":11,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619152_1.jpg?v=1750291794"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":50833004560665,"title":"68mm \/ 110mm","option1":"68mm","option2":"110mm","option3":null,"sku":"4550170619206","requires_shipping":true,"taxable":true,"featured_image":{"id":49897957720345,"product_id":9940980793625,"position":5,"created_at":"2025-06-19T11:36:41+09:30","updated_at":"2025-06-19T11:36:41+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:110mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619206_1.jpg?v=1750298801","variant_ids":[50833004560665]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 110mm","public_title":"68mm \/ 110mm","options":["68mm","110mm"],"price":3500,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619206","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:110mm] ","id":41251914744089,"position":5,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619206_1.jpg?v=1750298801"}},"requires_selling_plan":false,"selling_plan_allocations":[]}]

{"id":50832868213017,"title":"68mm \/ 107mm","option1":"68mm","option2":"107mm","option3":null,"sku":"4550170619282","requires_shipping":true,"taxable":true,"featured_image":{"id":49897958637849,"product_id":9940980793625,"position":4,"created_at":"2025-06-19T11:37:10+09:30","updated_at":"2025-06-19T11:37:10+09:30","alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:107mm] ","width":572,"height":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619282_1.jpg?v=1750298830","variant_ids":[50832868213017]},"available":true,"name":"Shimano Bb-un300 Square Taper Bottom Bracket - 68mm \/ 107mm","public_title":"68mm \/ 107mm","options":["68mm","107mm"],"price":3300,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"4550170619282","featured_media":{"alt":"Shimano Bb-un300 Square Taper Bottom Bracket [wdth:68mm Lgth:107mm] ","id":41251915464985,"position":4,"preview_image":{"aspect_ratio":1.0,"height":572,"width":572,"src":"\/\/bicyclesvictorharbor.com\/cdn\/shop\/files\/4550170619282_1.jpg?v=1750298830"}},"requires_selling_plan":false,"selling_plan_allocations":[]}

Shimano Bb-un300 Square Taper Bottom Bracket

All Bikes Are Only Avaliable Through Local Pickup

Christmas Standard Post Cut Offs Sending From SA

Christmas Express Post Cut Offs Sending From SA

You may also like

Recently viewed

Black Friday Sale On Now

Shimano Bb-un300 Square Taper Bottom Bracket

All Bikes Are Only Avaliable Through Local Pickup

Christmas Standard Post Cut Offs Sending From SA

Christmas Express Post Cut Offs Sending From SA